I am unsure if I could purchase a property through an LLC/SL based in Spain and what would be the taxation using this system.

If a single-family owner-occupied property is worth $400,000 - I wouldn't invest more than $280,000 (70%) in a note secured by the property.ITV takes priority over desired yield - so even if the note discounts to $350,000 based on desired yield, the investor still won't go beyond their maximum ITV. 

Jeff and John are extremely reasonable and may give you a handful more great ideas based of what your end goal is.  

Private Money Lenders (PML): More flexible, relationship-based funding with lower fees.

Does anyone have any tips/ advice to help make sure my property will appraise for what I planned on based on my rehab?

Then make your decision based on information.  

. $360k equity (based on your estimated loan balance and estimated transaction costs if you sold, this is not calculating capital gains taxes but that would reduce your equity down to about $310k if you sold without doing a 1031 exchange). $8k cash flow (this will increase over time because you are in an appreciation market). $6k principal pay down (based on your current loan). $20k appreciation (based on 3% which is conservative, 4-5% is the historical average).

It would likely be comparable to what you pay in the NE.Just google "Lexington County tax estimator" or whatever county you're interested in and you'll usually find a web tool from the County you can use to estimate the tax bill based on the previous year's assessments.There is also a law called the ATI tax exemption that can potentially lower than 6% rate by 25%.

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Use the 20K as a down payment on the next house hack and don't touch your current properties equity.